CVE-2024-26686
fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats
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fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats
In the Linux kernel, the following vulnerability has been resolved: fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats lock_task_sighand() can trigger a hard lockup. If NR_CPUS threads call do_task_stat() at the same time and the process has NR_THREADS, it will spin with irqs disabled O(NR_CPUS * NR_THREADS) time. Change do_task_stat() to use sig->stats_lock to gather the statistics outside of ->siglock protected section, in the likely case this code will run lockless.
Reserved 2024-02-19 | Published 2024-04-03 | Updated 2024-12-09 | Assigner Linuxgit.kernel.org/...c/cf4b8c39b9a0bd81c47afc7ef62914a62dd5ec4d
git.kernel.org/...c/3820b0fac7732a653bcc6f6ac20c1d72e697f8f6
git.kernel.org/...c/27978243f165b44e342f28f449b91327944ea071
git.kernel.org/...c/7601df8031fd67310af891897ef6cc0df4209305
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